"exile by ostracism, banish by popular vote," also in a figurative sense, "to exclude from society or favor," 1640s, from Latinized form of Greek ostrakizein "to banish," literally "to banish by voting with potshards" (see ostracism). Related: Ostracization; ostracized; ostracizing.
Proto-Indo-European root meaning "bone."
It forms all or part of: osseous; ossicle; ossuary; ossifrage; ossify; osteo-; osteology; osteopathy; ostracism; ostracize; oyster; periosteum.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit asthi, Hittite hashtai-, Greek osteon "bone," Greek ostrakon "oyster shell," Avestan ascu- "shinbone," Latin os (genitive ossis) "bone," osseus "bony, of bone," Welsh asgwrn, Armenian oskr, Albanian asht "bone."
1580s, the name of a legal political method among the ancient Athenians by which men deemed dangerous to the liberties of the people or embarrassing to the state were banished for 10 years by public vote, from French ostracisme (16c.), Modern Latin ostracismus, or directly from Greek ostrakismos, from ostrakizein "to ostracize," from ostrakon "tile, potsherd," from PIE *ost-r-, from root *ost- "bone," which also is the source of Greek osteon "bone," ostreion "oyster," and German Estrich "pavement" (which is from Medieval Latin astracus "pavement," ultimately from Greek ostrakon).
So called because the citizens each indicated the name of the man they wished banished by scratching it on a potsherd or tile. A similar practice in ancient Syracuse (with banishment for five years) was by writing names on olive leaves, and thus was called petalismos. In English, the word in the general sense of "expulsion, exclusion" (from society, etc.) is by early 17c.